基于预渗碳的H13钢TRD碳化铬覆层制备

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英文篇名：Preparation of TRD Chromium Carbide Coating on H13 Steel Based on Pre-carbonization 作者：李骢 ; 王华君 ; 牛龙飞 ; 王华昌 英文作者：LI Cong;WANG Huajun;NIU Longfei;WANG Huachang;School of Material Science and Engineering, Wuhan University of Technology; 关键词：H13钢 ; 预渗碳处理 ; TRD处理 ; 碳化铬覆层 英文关键词：H13 steel;;pre-carburizing treatment;;TRD(thermal reactive diffusion) treatment;;chromium carbide coating 中文刊名：SJGY 英文刊名：Hot Working Technology 机构：武汉理工大学材料科学与工程学院; 出版日期：2019-03-05 10:25 出版单位：热加工工艺 年：2019 期：v.48;No.506 基金：国家自然科学基金项目(51475346);; 湖北省自然科学基金项目(2012FFB05108) 语种：中文; 页：SJGY201904038 页数：4 CN：04 ISSN：61-1133/TG 分类号：157-160

摘要

对H13钢基体在预渗碳的基础上进行TRD渗铬处理,研究了预渗碳对覆层性能的影响。结果表明:预渗碳将覆层表面含碳量提高到了5.5%,避免了贫碳层的出现;复合覆层的表面硬度为2225.78 HV0.01,厚度最厚为15μm,其均匀连续且表面致密,主要由Cr_7C_3、Cr_(23)C_6组成;过渡渗碳层使复合覆层弹性模量下降平缓,改善了覆层的抗剥离性能。单一覆层薄且不连续,其表面硬度仅为1612.85 HV0.01且不稳定,主要物相为Fe、(Fe,Cr)_7C_3,界面存在贫碳层。
        TRD chromizing treatment was carried out on H13 steel matrix on the basis of pre-carburization, and the effects of pre-carburizing on the coating performance were studied. The results show that the pre-carburization increases the carbon content of surface layer to 5.5%, which can avoid the emergence of low-carbon layer. The surface hardness of the duplex coating is 2225.78 HV0.01, the maximum thickness is 15 μm. The duplex coating is uniform, continuous and compact,which is mainly composed of Cr_7C_3 and Cr_(23)C_6. And the transitional carburizing layer makes the elastic modulus decrease gently, which can improve the anti-peeling performance of the coating. The single coating is thin and discontinuous, whose surface hardness is only 1612.85 HV0.01 and unstable. The main phases are Fe and(Fe, Cr)_7C_3, and the decarburization layer appears on the interface.

引文

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